path1 = InstanceIdentifier.builder(Flows.class).child(Flow.class, key).toInstance();
// DataObject cls = (DataObject) modification.readConfigurationData(path1);
modification.putConfigurationData(path1, flow.build());
path1 = InstanceIdentifier.builder(Flows.class).child(Flow.class, key).toInstance();
// DataObject cls = (DataObject) modification.readConfigurationData(path1);
modification.putConfigurationData(path1, flow.build());